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After a successful run in San Francisco, Google Waze is heading to other cities.The rollout will have Waze competing against the likes of ride-sharing giants Uber and Lyft, both of whom already offer carpooling options — UberPool and Lyft Line.

Waze’s system allows drivers to make up to two rides a day — for example, to and from work — and riders pay to cover the cost of gas, plus a little extra.

The downside? A Carpool user has to request a shared ride several hours ahead of time, and then hope someone responds. If no one does, you can always jump in an Uber or Lyft.

With both Uber and Google continuing to make progress with their respective autonomous cars, it may not be too long before empty cars are driving up to collect passengers, giving both companies additional options over the kind of transportation services they offer.